Burner



Nov. 28, 1933. A. c. SMITH BURNER Filed May 7, 1950 m. Rm A m V l- 5 m "7.2 W. 5 JM ll [1% M V- M a aw l l n u u u um |w 5.2M l-i i i 5 WWMHWH g. l 57 a 111.1 m M m M j A M M 7m /fia Z ATTORNEY I Patented Nov. 28, 1933 UNITED STATES BURNER Aibert C. Smith, Woodside, N. Y., a'ssignor to Electrolux Servel Corporation, New York, N. Y., a corporation of Delaware ApplicationMay 7, 1930. Serial No 450,380

6 Claims.

This invention relates to devices for burning gaseous hydrocarbon fuels and more particularly to devices adapted to be used in conjunction with refrigerators of the absorption type for supplying heat thereto.

Among the objects of the present invention are to provide an improved burner having certain safety features, which may be more quickly and easily put in operation, which may be adjusted to burn diiferent volumes of gas, and which will be kept cool by air and thus maintain proper combustion.

Among the safety features it is essential that means be provided for shutting off the flow of ldgas in the event'that the flame is extinguished and that flash back be prevented. The first of these is accomplished inthe usual way by a bi metallic disk, the second is accomplished by the use of a reticulated screen. Further, the quick operating feature is obtained by providing means for bypassing the gas directly to the burner instead of in proximity to the bi-metallic disk.

The invention will first be hereinafter more particularly described with reference to the accompanying drawing which forms a part of this application and later pointed out in the claims at the end of the description.

In said drawing Fig. 1 is a part side elevational part sectional view of a burner illustrating one application of my invention;

Fig. 2 is a section on the line 22 and Fig. 3 is a section on the line 3-3 of. Fig. 1.

Referring to the drawing in which,like reference characters indicate similar parts throughout the several views,10 indicatesa valve body into which is threaded a supply pipe 11 for gas from a source of supply. The valve body 10 is provided with a longitudinal passage or bore 12 having a tapered enlargement 13 forming a valve seat for engagement by a valve 14. The valve 14 has a stem 15 and a knurled head 16 by means of which it may be rotated. The valve body 10 is. also provided with an enlarged recess 17 in the tapered inner end of which is disposed a quantity of packing material 18 pressed into engagement with the valve stem -by means of a spring 19 which spring also serves to maintain the valve in contact with its seat. A resilient locking member 20 is mounted on the valve body and engages the knurled head 16 and serves to maintain the head in'a fixed position, the resiliency of the locln'ng member 20 permitting inanual rotation of the .head and stem.

of Fig. 1;

. An annular upstanding boss or shoulder 21 is formed on the valve body 10 and at the center of the same is formed an upright concentric extension 22 provided with a longitudinal bore 23 which communicates with the bore 12 of the body 10. A tip 24 is fitted in the upper end of the bore of the extension 22 and is provided with a small orifice 25 through which gas may escape. A needle valve. 26.-is mounted in the bore 23 and has its lower end in engagement with the valve stem 15, said valve stem being cut away at 2'7 to provide a cam surface which amounts to an eccentric and which when rotated will move the needle valve longitudinally and vary the quantity of gas flowing through the discharge 76 About the shoulder 21 is fitted a casing member 28 having air inlet ports 29 for the admission of air for mixing with the gas flowing through the orifice 25. A pipe 30 which forms -75. the constricted neck of the burner has its lower end threaded into the upper end of the casing 28 and has its upper end provided with an enlargedcup 31 upon which is threaded the depending flange of the burner head 32. The head 32 0 comprises a disk having spaced discharge ports or nozzles formed by pipes 33 mounted in substantially parallel relation and having their lower ends secured to the disk 32 and opening into the cup 31. The burner tubes or pipes 33 have their upper ends flattened to provide elongated discharge orifices disposed radially of the burner head in order to cause a proper and through commingling of the air and gas at each discharge orifice. In order to prevent flash back, a screen 34 is secured in the cup 31 and has. its upper edge turned outwardly to form a rim adapted to fit over the upper edge of the cup and be secured in placeby the disk 32. The relatively large area of the screen 34 being larger 5 than the cross-sectional area of the pipe 30 does not constrict or ofier excessive resistance to the flow of mixed gases and consequently prevents back flash.

In order to dissipate heat, fins or radiating flanges 35 formed of metal of a high degree of conductivity are provided, a pair ofsuch fins being provided with an intermediate body portion 36 which snugly engages one individual burner tube 33. This application of the heat radiating fins at the hottest region of the burner serves to dissipate to the surrounding atmosphere by radiation and convection the heat of the flame which on ordinary burners is conducted along the burner and serves to heat the same to 10 a temperature sufficiently high to produce a marked inferiority in the character of the flame. This heating action causes a variation in the proportions of gas and air in the mixture and this change of ratio causes the flame to burn with the yellow tip due to insuflicient primary air.

It will be readily apparent that it is advantageous to employ a plurality of individual tubular ports or burner tubes for by so doing the cooling fins may be attached to each and thus afford a maximum cooling effect at the hottest region of the burner and at the same time provide for secondary air at all sides of each individual frame.

With the construction just described it will be understood that gas entering the burner through the supply pipe 11 will only pass through the bore 12 and upward through the burner when the head 16 is pressed to unseat the valve 14 and that rotation of the head controls the amount of gas allowed to escape through the orifice 25.

In order to provide a safety device for cutting oh the now of gas, in case the flame is extinguished without the supply of gas throughthepipe 11 being cut off, a snap action thermostatic disk 37 is provided which carries a valve member 38. This valve member 38 closes the flow between passages 39 and 40 to which pipes 41 and 42 connect with the body 10 on opposite sides of the valve 14. This safety device is generally of the type disclosed in Patent No. 1,711,398 to N. T. Sellman to which reference may be had for more detailed explanation of operation and construction.

In operation, after the burner has been lighted gas will flow from the pipe 11 up through the pipe 41, through the safety valve and down through the pipe 42 and through the bore 12 of the valve body, the valve 14 being closed. The thermostatic disk 37 is maintained in the position shown in Fig. 2 by heat conducted from the burner along a thermal conductive member 43 which projects into the flame or over the burner tip. When the flame is extinguished the member 43 cools and the valve member 38 connected to the disk 3'? closes with a snap action and cuts off the supply of gas to the burner. In lighting, the bypass valve 14 is opened by pressing the head 16 until the gas is" ignited and has had time to heat the member 43 and the safety disk and permit the flow of gas-through the safety valve, the flow of gas being regulated by rotating the push button 16.

The cardinal features of this invention as will be readily apparent reside in the unique manner of cooling the burner head, the provision of unitary means which may be operated to perform the two fold function of allowing gas to flow directly tothe burner and to control the quantity of such gas, and the flash back preventing means.

It will be obvious to those skilled in the art that various changes may be made without de- 1. In a burner for gaseous fuel, means for shutting off the flow of fuel to the burner when the" flame is extinguished, a bypass valve for permitting flow of gas in order that the burnermay be lighted, manual operating means for said bypass valve, and a valve for controlling the volume of gas flowing to the burner adjustable by said manual operating means without affecting position of said by-pass valve.

2. In a gaseous fuel burner, the combination of a burner head, means associated with said burner head for shutting off the flow of fuel to the burner when the flame is extinguished, a bypass valve for. permitting flow of gas to the burner head in order that the burner may be lighted, a valve for controlling the volume of gas flowing to the burner, and a common means for independently operating said valves.

3. A device of the class described comprising a burner head, thermal responsive means for interrupting the flow of fuel to the burner head, adjustable means for varying the flow to the burner head, and means operable to by-pass the flow of fuel around said thermostatic means and independently operable to vary said adjustable means.

4. In combination, a valve body having a longitudinal bore, a valve seat in said bore, an inlet on one side of said valve seat, an outlet at the other side of said valve seat, a connection with said bore extending between opposite sides of the valve seat, a thermostatically controlled valve in said connection, a burner associated with said outlet, a control valve in said outlet for varying the supply to the burner and having a stem projecting into said longitudinal bore, a valve memher for engaging said valve seat, and a rod operatively connected to said valve member extending through said longitudinal bore having a cam surface engaging said stem and provided with an operating portion disposed exteriorly of said valve body whereby the rod may be moved longitudinally to unseat said valve member and independently moved for varying the adjustment of the control valve.

5. In a burner for gaseous fuel, an adjustable fuel supply valve, a thermal responsive cut-off valve in the fuel supply line, a normally closed by-pass valve around said cut-off valve, and common means for independently operating said supply and by-pass valves.

6. In a burner for gaseous fuel, anadjustable fuel supply valve, a thermal responsive cut-off valve in the fuel supply line, a normally closed by-pass around said cut-off valve, and means reciprocable to open said by-pass and independently rotatable to adjust said supply valve.

ALBERT C. SMITH. 

